fix: imagegen constructor

Author: Lin Fangyuan

volcengine-java-sdk-ark-runtime/src/main/java/com/volcengine/ark/runtime/model/images/generation/GenerateImagesRequest.java

@@ -34,15 +34,16 @@ public class GenerateImagesRequest {
     public GenerateImagesRequest() {
     }
 
-    public GenerateImagesRequest(String model, String prompt, String image, String responseFormat, Integer seed, Double guidanceScale, String size) {
+    public GenerateImagesRequest(String model, String prompt, String image, String responseFormat, Integer seed, Double guidanceScale, String size, Boolean watermark, Boolean optimizePrompt) {
         this.model = model;
         this.prompt = prompt;
         this.image = image;
         this.responseFormat = responseFormat;
         this.seed = seed;
         this.guidanceScale = guidanceScale;
         this.size = size;
-        this.watermark = false;
+        this.watermark = watermark;
+        this.optimizePrompt = optimizePrompt;
     }
 
     public String getModel() {